Alright, let's work through 3666 times 5426 step by step
3666 × 5426 = 5426 × (3666)
+ 5426 × 6 that results in 32556
+ 5426 × 60 that equals 325560
+ 5426 × 600 that results in 3255600
+ 5426 × 3000 giving us 16278000

= 19891716
